The Phoenix - AoT

The life of the Phoenix symbolizes: a second chance, Immortality and getting up again, even when you have fallen many times.

The Phoenix represents a new beginning, that no matter how hard that things may get, you have got to get back up on your feet (rise out of the ashes).

That's what the phoenix teaches: the determination to fight back, the strength to accept the second chance and make It a brand new beginning of a beautiful life. No matter how hard life may get, how difficult the situations might turn, you have to put your bits of courage together and fight back. Life is too short to accept defeat like a coward. You might not be as successful, but yet have the satisfaction that you gave your complete best to your struggle. Because life is too short to look back and say "I wish I did that" instead of "I'm glad I did!" - Anonymous
...
"See you later, Eren" she had said

and Eren Jaeger, the Devil of Paradis Island, was no more.
...
Which was supposed to be the outcome, however, instead of Eren awakening in the abyss of hell, he found himself waking up to a familiar infirmary that he had not seen for several years. Oh, and not only that, but he was also chained down. Fun.